Base for bipper teeth



Dec. 26, 1922. 1,440,212.

J. F. DEVLIN.

BASE FOR DIPPER TEETH HLED DEC-30.1921.

//// Q T 6: gwuwntoi Patented Dec. 26, 1922.

UNITED srA'rss PATENTIOFFICE.

JOHN F. DEVLIN, OF HIGH BRIDGE, NEW JERSEY, ASSIGNOR TC TAYLOR-WHARTONIRON AND STEEL COMPANY, OF HIGH BRIDGE, NEW JERSEY, A CORPORATION 0F sNEW JERSEY.

BASE FOR DEPT-ER TEETH.

Application filed December 30, 1921. Serial No. 525,988.

To all whom it may concern:

Be it known that I, JOHN F. DnvLDI, a citizen of the United'States,residing at High Bridge, in the county of Hunterdon and State of NewJersey, have invented certainnew and useful Improvements in Bases forDipper Teeth, of which the following is a specification.

This invention relates to excavating, dredging, digging and similarmachinery, and more particularly to the carrying members or bases whichsupport and carry the digging teeth of the clippers or buckets. Suchbases are usually formed with a forwardly extending wedge-shape noseportion to receive the dipper tooth and with rearwardly extendingreaches which are riveted or bolted to the bucket. Sometimes the basesare forged, but the standard practice is to cast them from alloy steel,such as manganese steel. The preponderance of metal at and in the regionof the nose precludes proper heat treatment. it results thatcomparatively thin sections of metal, where the stress is practicablynegligible, have the usual toughness and shock and wear resistiveproperties characteristic of manganese steel properly heat treated,while the mass of metal at the nose, or region of severest stress, isinherently weak because of a localization of cementite due to lack ofheat treatment, faulty or non-uniform heat treatment. This conditionaccounts in the main for the breaking of bases. I

The object of my invention is to provide a cast base, whereof the metalis so distributed as to insure substantial uniformity of heat treatment,and which, while obviating the inherent wealmesshereinbefore mentioned,also makes for rapid production inasmuch as it does not require anindividual or special cope or a separate core to be hung in the cope toremove the metal.

Referring to the annexed drawing forma part hereof,

Figure 1. is a side elevational view of a base embodying my invention. I

Fig. 2. is a section on line 2-2 of Fig. 1.

Fig. 8. is a side elevational view of a modification.

Fig. 4. is a section on line 4:4l of Fig. 8.

Fig. 5. is a side elevational view of a further modification; and

.jig. 6. is a section on line: 6-6 of Fig. 5.

ln practicing my invention 1 remove the metal from the longer reach orarm 5, as indicated in dotted lines, so that the base, for a materialportion of its length, is of hollow polygonal or box section, with walls(3 of substantially uniform thickness. In Fig. 1. the hollow orchambered formation extends from the nose 7 rearwardly for substantiallytwo-thirds of the length of the arm or reach 5.

In Figs. 3 and a a substantially tubular base is shown, the core 8starting with a flare 9 developed in the nose and eventuating at thetail of the base in a channel section 10. p

In Figs. 5 and 6, the chambered or box section 11 stops just beyond thedepth of the lower reach, and is then continued in channel form 12.

In all three constructions, I provide for substantiah uniformity ofmetal sections which makes for proper heat treatment, and incidentallyobtain all of the advantages of an I-beam section as regards strengthand resistance to bending.

The nose 7 of the base may be of the usualor any appropriate form, and,except in the important particular noted as regards the essence of theinvention, the base may be as usual.

Having described the nature and object of my invention, I claim,-

1. A base for dipper teeth having a material part thereof of hollowpolygonal section.

2. A base for dipper teeth having a material part thereof of box sectionwith walls of substantially uniform thickness.

3. A base for dipper teeth of hollow polygonal section in the region ofthe nose to provide for uniformity of heat treatment.

i. A. base for dipper teeth of hollow polygonal section at and in theregion of the nose, and thence continued in channel form.

5. A base for dipper teeth whereof the. main arm or reach is of hollowpolygonal. section in its thickest portion with walls of uniformthickness and terminating in channel section.

6. A base for dipper teeth having an axial cored portion starting at thenose and terminating at the tail.

7. A base for dipper teeth having an unthickness, said box sectioneventuating in 10 interrupted axial cored portion. 7 a solid tailportion. V

8. Abase for clipper teeth, having ana-xial 1 0. A-cast manganesesteelbase fordipper cored portion the effective length thereof, teeth havinga box section nose and a sub 5 and Which is flared at the nose.stantially channel section tail to thereby 9. A base for dipper teethhav'ingthe preprovide-substantially uniforfn thicknesses of 15p'ondera-nt mass of metal at and in the vi metal for heat treatmentpurposes. cinity of the nose of endWise directed box In testimonywhereof I affiX mysignetm'e' section With walls of substantially uniformJOHN F. DEVLIN.

